Female-only gathering (3,5)
I believe the answer is:
hen party
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">female-only gathering</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hen party that I've seen before include "One last night of debauchery" , "A social gathering confined to women" , "Females celebrating" , "occasion lacking men" , "Event to which stags are not invited" .)